Yoshitake 150L-13F is a plain sight glass with a cast stainless steel (SCS13) body and JIS 10K FF flanged connection. It is designed to allow visual checking of fluid flow, mixed states, and colors in horizontal or vertical piping systems. The sight glass is suitable for cold and hot water, oil, and other non-dangerous fluids up to 1.0 MPa and 150°C.

Features

• Mixed state or color of two component fluid can be checked.
• Intermittent fluid flow can be checked.
• Can be connected to horizontal or vertical piping.
• The 150L Series sight glass comes in cast stainless steel, meeting wider applications.
• Available with mica plate for steam condensate (maximum allowable working pressure is 0.6 MPa).

Specifications

Specification	Value
Type	Plain
Application	Cold and hot water, Oil, Other non-dangerous fluids
Nominal size	15A-100A
Maximum working pressure	1.0 MPa
Max. temperature	150℃
Max. thermal shock	100℃
Body	Cast stainless steel (SCS13)
Glass	Hardened glass
Connection	JIS 10K FF flanged

INFO

• Available with mica plate for steam condensate. However, maximum allowable working pressure is 0.6 MPa.
• Glass parts are consumable parts.

Dimensions and Weights

Nominal size	L (mm)	A (mm)	W (mm)	Weight (kg)
15A	130	73.5	35	2.12
20A	130	73.5	35	2.47
25A	150	89.0	44	4.1
32A	160	114.0	53	5.4
40A	170	115.5	57	5.6
50A	200	147.0	73	9.7
65A	235	175.0	97	16.0
80A	235	175.0	97	16.5
100A	277	244.0	130	29.2

(Note: Dimensions A and W are from the product dimensional drawing, L and Weight are from the main catalog.)

Parts and Materials

No.	Name of Parts	Material
1	Body	Cast Stainless Steel (SCS13)
2	Cover	Cast Stainless Steel (SCS13)
3	Glass	Tempered Glasses
4	Gasket	Non-Asbestos
6	Bolt	Stainless Steel (SUS)
7	Nut	Stainless Steel (SUS)
8	Gasket	Non-Asbestos

Installation and Operation

Precaution for installation

1. Before connecting the product to piping, confirm that the product specifications are sufficient for the service condition.
2. Before connecting the product to piping, remove foreign substances and dirt inside the piping to prevent glass damage or opacity.
3. For steam condensate application, make sure to use the product with mica plates to protect the glasses.
4. Do not apply excessive load, torque, or vibration to the product.

Precaution for operation

1. Do not apply a rapid temperature change to the product during both initial and usual operations. A rapid temperature change may damage the glass resulting in a blowout of the fluid.
2. When the product is used for hot fluid, do not touch the product with bare hands.
3. The glasses are consumable parts. Replace the glass if it is eroded by more than 10% of its thickness or if it has scratches or flaws.

Disassembly and Reassembly

Precaution for disassembly

Completely discharge the pressure inside of the product, piping and equipment prior to disassembly and inspection. When fluid is hot, cool down the product to the condition that it can be touched with bare hands.

Disassembly

1. Completely discharge the pressure inside of the product.
2. Remove the bolts and nuts.
3. Take out the covers and glasses. If the glass sticks to the body and hardly comes off, put the cover on the glass in a way that the outer circumference of the glass fits the inner circumference of the cover, and then tap the cover on its outer side.

Reassembly

1. Clean the gasket spaces of the body, covers, and glasses.
2. Attach the gaskets, glasses, and gaskets in this order to the covers and assemble them to the body.
3. To fix the covers to the body, firstly tighten them temporarily with bolts and nuts, and then tighten them evenly at the specified torque by using a torque wrench.

Nominal size	Tightening torque
15A, 20A	7 N·m
25A, 32A	10 N·m
40A	15 N·m
50A	25 N·m
65A-100A	29.4 N·m

Troubleshooting

Trouble	Cause	Remedy
Fluid flow cannot be observed.	1. Foreign substances stick to the inner surface of the glass. 2. The inner surface of the glass has erosion or scratches.	1. Disassemble and clean the product. 2. Disassemble the product and replace the glass.
Outside leakage	1. The gasket leaks. 2. The glass is damaged.	1. Disassemble the product and replace the gasket. 2. Disassemble the product and replace the glass.